L. The unsubmerged portion =
| Cubic ft. | Ton. | Tons. | |
|---|---|---|---|
| 30 ft. × 5 ft. × 1 ft. = | 150 × | 0·056 | = 8·40 |
The submerged portion =
30 ft. × 20 ft. × 1 ft. = 600 × (0·056 – 0·028) = 16·80
25·20
| 25·20 | ||
| Consequently the pressure = | = 0·84 ton per square foot, | |
| 30 | ||
| K |
a difference of 0·56 ton per square foot, or 40 per cent. less load.
M. And upon the base of the central portion—
| AT LOW WATER. | |||
| Cubic ft. | Ton. | Tons. | |
| 30 ft. × 30 ft. × 1 ft. = | 900 × | 0·056 | = 50·40. |
| 50·40 | ||
| The pressure is, therefore, equal to | = 1·68 ton per square foot. | |
| 30 | ||
| K | ||
| AT HIGH WATER. | ||
N. The unsubmerged portion =